My mother-in-law Renate is an excellent baker. One of the stars in her repertoire is apple cake. Whenever Renate visits she asks, “Shall I make a cake?” We always say yes and “How about the apple cake!” It’s not  a cake in the way you’d think, with flour and a leavener. It’s more like French clafoutis, with a bottom crust.Renate uses an unusual method with the dough (made with butter and an egg, giving it a more cookie-like rather than flakey structure). After it’s chilled, she slices the dough and presses the pieces into the bottom and halfway up the sides of a spring form cake pan. Then she adds a particularly German touch. She sprinkles unseasoned homemade breadcrumbs over the dough. The recipe comes from Chef Tell, one of her favorite chefs. He was a German chef who had a PBS program “In the Kitchen with Chef Tell” in the 70s and 80s. Renate scores apple halves, places them on the breadcrumbs, and pours a custard of eggs, sour cream, cream  and vanilla over the apples. After it bakes and cools, …